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並前往http://adripofjavascript.com/blog/drips/the-uses-of-in-vs-hasownproperty.html

The Uses of 'in' vs 'hasOwnProperty' - A Drip of JavaScript

The in operator will tell you whether an object (or array) has a property name which matches a given string. var fantasyLit = { tolkien: "The Lord of the ...

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